com.aspose.imaging.fileformats.djvu

Field Detail

• PropertyChanged

  public final com.aspose.ms.lang.Event<com.aspose.ms.System.ComponentModel.PropertyChangedEventHandler> PropertyChanged

Constructor Detail

• DjvuImage

  public DjvuImage(InputStream stream)

  Initializes a new instance of the DjvuImage class.

  Parameters:

  stream - The stream.

  Throws:

  DjvuImageException - Stream is empty

  Code example:

  This example shows how to load a DJVU image from a file stream.

  ---

  String dir = "c:\\temp\\";
  
  // Load a DJVU image from a file stream.
  java.io.InputStream stream = new java.io.FileInputStream(dir + "sample.djvu");
  com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream);
  try {
      // Save each page as an individual PNG image.
      for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) {
          // Generate a file name based on the page number.
          String fileName = String.format("sample.%s.png", djvuPage.getPageNumber());
          djvuPage.save(dir + fileName, new com.aspose.imaging.imageoptions.PngOptions());
      }
  } finally {
      djvuImage.dispose();
      stream.close();
  }
  

  ---

• DjvuImage

  public DjvuImage(InputStream stream,
                   LoadOptions loadOptions)

  Initializes a new instance of the DjvuImage class.

  Parameters:

  stream - The stream to load from.

  loadOptions - The load options.

  Throws:

  DjvuImageException - Stream is empty

  Code example:

  This example shows how to load a DJVU image from a file stream to stay within the specified memory limit.

  ---

  String dir = "c:\\temp\\";
  
  // Load a DJVU image from a file stream.
  java.io.InputStream stream = new java.io.FileInputStream(dir + "sample.djvu");
  try {
      // The max allowed size for all internal buffers is 1MB.
      com.aspose.imaging.LoadOptions loadOptions = new com.aspose.imaging.LoadOptions();
      loadOptions.setBufferSizeHint(1 * 1024 * 1024);
  
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream, loadOptions);
      try {
          // Save each page as an individual PNG image.
          for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) {
              // Generate a file name based on the page number.
              String fileName = String.format("sample.%s.png", djvuPage.getPageNumber());
              djvuPage.save(dir + fileName, new com.aspose.imaging.imageoptions.PngOptions());
          }
      } finally {
          djvuImage.dispose();
      }
  } finally {
      stream.close();
  }
  

  ---

• DjvuImage

  public DjvuImage(com.aspose.ms.System.IO.Stream stream,
                   LoadOptions loadOptions)

  Initializes a new instance of the DjvuImage class.

  Parameters:

  stream - The stream.

  loadOptions - The load options.

Method Detail

• getIdentifier

  public int getIdentifier()

  Gets the unique identifier for the document

  Returns:

  The identifier.

• getPageCount

  public int getPageCount()

  Gets the page count.

  Value: The page count. <autogeneratedoc></autogeneratedoc>

  Specified by:

  getPageCount in interface IMultipageImage

  Specified by:

  getPageCount in class RasterCachedMultipageImage

  Returns:

  the page count.

• getPages

  public Image[] getPages()

  Gets the pages.

  Value: The pages. <autogeneratedoc></autogeneratedoc>

  Specified by:

  getPages in interface IMultipageImage

  Specified by:

  getPages in class RasterCachedMultipageImage

  Returns:

  the pages.

  Code example:

  This example shows how to load a DJVU image from a file stream.

  ---

  String dir = "c:\\temp\\";
  
  // Load a DJVU image from a file stream.
  java.io.InputStream stream = new java.io.FileInputStream(dir + "sample.djvu");
  com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream);
  try {
      // Save each page as an individual PNG image.
      for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) {
          // Generate a file name based on the page number.
          String fileName = String.format("sample.%s.png", djvuPage.getPageNumber());
          djvuPage.save(dir + fileName, new com.aspose.imaging.imageoptions.PngOptions());
      }
  } finally {
      djvuImage.dispose();
      stream.close();
  }
  

  ---

• getDjvuPages

  public final DjvuPage[] getDjvuPages()

  Gets the pages for the document

  Value: The pages.

  Returns:

  the pages for the document

• getDefaultPage

  public Image getDefaultPage()

  Gets the default page.

  Value: The default page. <autogeneratedoc></autogeneratedoc>

  Specified by:

  getDefaultPage in interface IMultipageImage

  Specified by:

  getDefaultPage in class RasterCachedMultipageImage

  Returns:

  the default page.

• getActivePage

  public DjvuPage getActivePage()

  Gets or sets the currently active page

  Returns:

  The active page.

  Throws:

  DjvuImageException - There is no active page selected.

  Code example:

  This example shows how to load a DJVU image from a file stream and print information about the pages.

  ---

  String dir = "c:\\temp\\";
  
  // Load a DJVU image from a file stream.
  java.io.FileInputStream stream = new java.io.FileInputStream(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream);
      try {
          System.out.println("The total number of pages: " + djvuImage.getPages().length);
          System.out.println("The active page number:    " + djvuImage.getActivePage().getPageNumber());
          System.out.println("The first page number:     " + djvuImage.getFirstPage().getPageNumber());
          System.out.println("The last page number:      " + djvuImage.getLastPage().getPageNumber());
  
          for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) {
              System.out.println("--------------------------------------------------");
              System.out.println("Page number:     " + djvuPage.getPageNumber());
              System.out.println("Page size:       " + djvuPage.getSize());
              System.out.println("Page raw format: " + djvuPage.getRawDataFormat());
          }
      } finally {
          djvuImage.dispose();
      }
  } finally {
      stream.close();
  }
  
  //The output may look like this:
  //The total number of pages: 2
  //The active page number:    1
  //The first page number:     1
  //The last page number:      2
  //--------------------------------------------------
  //Page number:     1
  //Page size:       { Width = 2481, Height = 3508}
  //Page raw format: RgbIndexed1Bpp, used channels: 1
  //--------------------------------------------------
  //Page number:     2
  //Page size:       { Width = 2481, Height = 3508}
  //Page raw format: RgbIndexed1Bpp, used channels: 1
  

  ---

• setActivePage

  public void setActivePage(DjvuPage value)

  Gets or sets the currently active page

  Parameters:

  value - The active page.

  Throws:

  DjvuImageException - When the active page cannot be set as it belongs to another image.

• getFirstPage

  public DjvuPage getFirstPage()

  Gets the first page of the document

  Returns:

  The first page.

  Throws:

  DjvuImageException - The first page can not be found

  Code example:

  This example shows how to load a DJVU image from a file stream and print information about the pages.

  ---

  String dir = "c:\\temp\\";
  
  // Load a DJVU image from a file stream.
  java.io.FileInputStream stream = new java.io.FileInputStream(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream);
      try {
          System.out.println("The total number of pages: " + djvuImage.getPages().length);
          System.out.println("The active page number:    " + djvuImage.getActivePage().getPageNumber());
          System.out.println("The first page number:     " + djvuImage.getFirstPage().getPageNumber());
          System.out.println("The last page number:      " + djvuImage.getLastPage().getPageNumber());
  
          for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) {
              System.out.println("--------------------------------------------------");
              System.out.println("Page number:     " + djvuPage.getPageNumber());
              System.out.println("Page size:       " + djvuPage.getSize());
              System.out.println("Page raw format: " + djvuPage.getRawDataFormat());
          }
      } finally {
          djvuImage.dispose();
      }
  } finally {
      stream.close();
  }
  
  //The output may look like this:
  //The total number of pages: 2
  //The active page number:    1
  //The first page number:     1
  //The last page number:      2
  //--------------------------------------------------
  //Page number:     1
  //Page size:       { Width = 2481, Height = 3508}
  //Page raw format: RgbIndexed1Bpp, used channels: 1
  //--------------------------------------------------
  //Page number:     2
  //Page size:       { Width = 2481, Height = 3508}
  //Page raw format: RgbIndexed1Bpp, used channels: 1
  

  ---

• getLastPage

  public DjvuPage getLastPage()

  Gets the last page of the document

  Returns:

  The last page.

  Throws:

  DjvuImageException - The last page can not be found

  Code example:

  This example shows how to load a DJVU image from a file stream and print information about the pages.

  ---

  String dir = "c:\\temp\\";
  
  // Load a DJVU image from a file stream.
  java.io.FileInputStream stream = new java.io.FileInputStream(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream);
      try {
          System.out.println("The total number of pages: " + djvuImage.getPages().length);
          System.out.println("The active page number:    " + djvuImage.getActivePage().getPageNumber());
          System.out.println("The first page number:     " + djvuImage.getFirstPage().getPageNumber());
          System.out.println("The last page number:      " + djvuImage.getLastPage().getPageNumber());
  
          for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) {
              System.out.println("--------------------------------------------------");
              System.out.println("Page number:     " + djvuPage.getPageNumber());
              System.out.println("Page size:       " + djvuPage.getSize());
              System.out.println("Page raw format: " + djvuPage.getRawDataFormat());
          }
      } finally {
          djvuImage.dispose();
      }
  } finally {
      stream.close();
  }
  
  //The output may look like this:
  //The total number of pages: 2
  //The active page number:    1
  //The first page number:     1
  //The last page number:      2
  //--------------------------------------------------
  //Page number:     1
  //Page size:       { Width = 2481, Height = 3508}
  //Page raw format: RgbIndexed1Bpp, used channels: 1
  //--------------------------------------------------
  //Page number:     2
  //Page size:       { Width = 2481, Height = 3508}
  //Page raw format: RgbIndexed1Bpp, used channels: 1
  

  ---

• getNextPage

  public DjvuPage getNextPage()

  Gets the next page of the document

  Returns:

  The next page.

  Throws:

  DjvuImageException - The next page can not be found

• getPreviousPage

  public DjvuPage getPreviousPage()

  Gets the previous page of the document

  Returns:

  The previous page.

  Throws:

  DjvuImageException - The previous page can not be found

• getFileFormat

  public long getFileFormat()

  Gets a value of file format

  Overrides:

  getFileFormat in class Image

• hasAlpha

  public boolean hasAlpha()

  Gets the Has alpha channel.

  Value: The Has alpha channel. <autogeneratedoc></autogeneratedoc>

  Overrides:

  hasAlpha in class RasterCachedMultipageImage

  Returns:

  the Has alpha channel.

• loadDocument

  public static DjvuImage loadDocument(InputStream stream)

  Loads the document.

  Parameters:

  stream - The stream.

  Returns:

  Loaded djvu document

• loadDocument

  public static DjvuImage loadDocument(InputStream stream,
                                       LoadOptions loadOptions)

  Loads the document.

  Parameters:

  stream - The stream.

  loadOptions - The load options.

  Returns:

  Loaded djvu document

• rotate

  public void rotate(float angle,
                     boolean resizeProportionally,
                     Color backgroundColor)

  !:RasterCahcedMultipageImage.Rotate image around the center.

  Overrides:

  rotate in class RasterCachedMultipageImage

  Parameters:

  angle - The rotate angle in degrees. Positive values will rotate clockwise.

  resizeProportionally - if set to true you will have your image size changed according to rotated rectangle (corner points) projections in other case that leaves dimensions untouched and only image contents are rotated.

  backgroundColor - Color of the background.

• resize

  public void resize(int newWidth,
                     int newHeight,
                     int resizeType)

  Resizes the image.

  Overrides:

  resize in class RasterCachedMultipageImage

  Parameters:

  newWidth - The new width.

  newHeight - The new height.

  resizeType - The resize type.

  Code example:

  This example loads a DJVU image and resizes it using various resizing methods.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale up by 2 times using Nearest Neighbour resampling.
      image.resize(image.getWidth() * 2, image.getHeight() * 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);
  
      // Save to PNG with default options.
      image.save(dir + "upsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale down by 2 times using Nearest Neighbour resampling.
      image.resize(image.getWidth() / 2, image.getHeight() / 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);
  
      // Save to PNG with default options.
      image.save(dir + "downsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale up by 2 times using Bilinear resampling.
      image.resize(image.getWidth() * 2, image.getHeight() * 2, com.aspose.imaging.ResizeType.BilinearResample);
  
      // Save to PNG with default options.
      image.save(dir + "upsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale down by 2 times using Bilinear resampling.
      image.resize(image.getWidth() / 2, image.getHeight() / 2, com.aspose.imaging.ResizeType.BilinearResample);
  
      // Save to PNG with default options.
      image.save(dir + "downsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• resizeWidthProportionally

  public void resizeWidthProportionally(int newWidth,
                                        int resizeType)

  Resizes the width proportionally.

  Overrides:

  resizeWidthProportionally in class RasterCachedMultipageImage

  Parameters:

  newWidth - The new width.

  resizeType - Type of the resize.

  Code example:

  This example loads a DJVU image and resizes it proportionally using various resizing methods. Only the width is specified, the height is calculated automatically.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale up by 2 times using Nearest Neighbour resampling.
      image.resizeWidthProportionally(image.getWidth() * 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);
  
      // Save to PNG with the default options.
      image.save(dir + "upsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale down by 2 times using Nearest Neighbour resampling.
      image.resizeWidthProportionally(image.getWidth() / 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);
  
      // Save to PNG with the default options.
      image.save(dir + "downsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale up by 2 times using Bilinear resampling.
      image.resizeWidthProportionally(image.getWidth() * 2, com.aspose.imaging.ResizeType.BilinearResample);
  
      // Save to PNG with the default options.
      image.save(dir + "upsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale down by 2 times using Bilinear resampling.
      image.resizeWidthProportionally(image.getWidth() / 2, com.aspose.imaging.ResizeType.BilinearResample);
  
      // Save to PNG with the default options.
      image.save(dir + "downsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• resizeHeightProportionally

  public void resizeHeightProportionally(int newHeight,
                                         int resizeType)

  Resizes the width proportionally.

  Overrides:

  resizeHeightProportionally in class RasterCachedMultipageImage

  Parameters:

  newHeight - The new height.

  resizeType - Type of the resize.

  Code example:

  This example loads a DJVU image and resizes it proportionally using various resizing methods. Only the height is specified, the width is calculated automatically.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale up by 2 times using Nearest Neighbour resampling.
      image.resizeHeightProportionally(image.getHeight() * 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);
  
      // Save to PNG with the default options.
      image.save(dir + "upsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale down by 2 times using Nearest Neighbour resampling.
      image.resizeHeightProportionally(image.getHeight() / 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);
  
      // Save to PNG with the default options.
      image.save(dir + "downsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale up by 2 times using Bilinear resampling.
      image.resizeHeightProportionally(image.getHeight() * 2, com.aspose.imaging.ResizeType.BilinearResample);
  
      // Save to PNG with the default options.
      image.save(dir + "upsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // Scale down by 2 times using Bilinear resampling.
      image.resizeHeightProportionally(image.getHeight() / 2, com.aspose.imaging.ResizeType.BilinearResample);
  
      // Save to PNG with the default options.
      image.save(dir + "downsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• rotateFlip

  public void rotateFlip(int rotateFlipType)

  Rotates, flips, or rotates and flips the Active frame only.

  Overrides:

  rotateFlip in class RasterCachedMultipageImage

  Parameters:

  rotateFlipType - The rotate flip type.

  See Also:

  RotateFlipType

  Code example:

  This example loads a DJVU image, rotates it by 90 degrees clockwise and optionally flips the image horizontally and(or) vertically.

  ---

  String dir = "c:\\temp\\";
  
  int[] rotateFlipTypes = new int[]
          {
                  com.aspose.imaging.RotateFlipType.Rotate90FlipNone,
                  com.aspose.imaging.RotateFlipType.Rotate90FlipX,
                  com.aspose.imaging.RotateFlipType.Rotate90FlipXY,
                  com.aspose.imaging.RotateFlipType.Rotate90FlipY,
          };
  
  for (int rotateFlipType : rotateFlipTypes) {
      // Rotate, flip and save to the output file.
      com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
      try {
          image.rotateFlip(rotateFlipType);
          image.save(dir + "sample." + rotateFlipType + ".png", new com.aspose.imaging.imageoptions.PngOptions());
      } finally {
          image.dispose();
      }
  }
  

  ---

• dither

  public void dither(int ditheringMethod,
                     int bitsCount,
                     IColorPalette customPalette)

  Performs dithering on the current image.

  Overrides:

  dither in class RasterCachedMultipageImage

  Parameters:

  ditheringMethod - The dithering method.

  bitsCount - The final bits count for dithering.

  customPalette - The custom palette for dithering.

  Code example:

  The following example loads a DJVU image and performs threshold and floyd dithering using different palette depth.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage dicomImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Perform threshold dithering using 4-bit color palette which contains 16 colors.
      // The more bits specified the higher quality and the bigger size of the output image.
      // Note that only 1-bit, 4-bit and 8-bit palettes are supported at the moment.
      dicomImage.dither(com.aspose.imaging.DitheringMethod.ThresholdDithering, 4, null);
  
      dicomImage.save(dir + "sample.ThresholdDithering4.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage dicomImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Perform floyd dithering using 1-bit color palette which contains only 2 colors - black and white.
      // The more bits specified the higher quality and the bigger size of the output image.
      // Note that only 1-bit, 4-bit and 8-bit palettes are supported at the moment.
      dicomImage.dither(com.aspose.imaging.DitheringMethod.FloydSteinbergDithering, 1, null);
  
      dicomImage.save(dir + "sample.FloydSteinbergDithering1.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• crop

  public void crop(Rectangle rectangle)

  Cropping the image.

  Overrides:

  crop in class RasterCachedMultipageImage

  Parameters:

  rectangle - The rectangle.

  Code example:

  The following example crops a DJVU image. The cropping area is be specified via Aspose.Imaging.Rectangle.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Crop the image. The cropping area is the rectangular central area of the image.
      com.aspose.imaging.Rectangle area = new com.aspose.imaging.Rectangle(
              djvuImage.getWidth() / 4, djvuImage.getHeight() / 4, djvuImage.getWidth() / 2, djvuImage.getHeight() / 2);
      djvuImage.crop(area);
  
      // Save the cropped image to PNG
      djvuImage.save(dir + "sample.Crop.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• crop

  public void crop(int leftShift,
                   int rightShift,
                   int topShift,
                   int bottomShift)

  Crop image with shifts.

  Overrides:

  crop in class RasterCachedMultipageImage

  Parameters:

  leftShift - The left shift.

  rightShift - The right shift.

  topShift - The top shift.

  bottomShift - The bottom shift.

• binarizeFixed

  public void binarizeFixed(byte threshold)

  Binarization of an image with predefined threshold

  Overrides:

  binarizeFixed in class RasterCachedMultipageImage

  Parameters:

  threshold - Threshold value. If corresponding gray value of a pixel is greater than threshold, a value of 255 will be assigned to it, 0 otherwise.

  Code example:

  The following example binarizes a DJVU image with the predefined threshold. Binarized images contain only 2 colors - black and white.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Binarize the image with a threshold value of 127.
      // If a corresponding gray value of a pixel is greater than 127, a value of 255 will be assigned to it, 0 otherwise.
      djvuImage.binarizeFixed((byte) 127);
      djvuImage.save(dir + "sample.BinarizeFixed.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• binarizeOtsu

  public void binarizeOtsu()

  Binarization of an image with Otsu thresholding

  Overrides:

  binarizeOtsu in class RasterCachedMultipageImage

  Code example:

  The following example binarizes a DJVU image with Otsu thresholding. Binarized images contain only 2 colors - black and white.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Binarize the image with Otsu thresholding.
      djvuImage.binarizeOtsu();
      djvuImage.save(dir + "sample.BinarizeOtsu.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• binarizeBradley

  public void binarizeBradley(double brightnessDifference,
                              int windowSize)

  Binarization of an image using Bradley's adaptive thresholding algorithm using the integral image thresholding

  Overrides:

  binarizeBradley in class RasterCachedMultipageImage

  Parameters:

  brightnessDifference - The brightness difference between pixel and the average of an s x s window of pixels centered around this pixel.

  windowSize - The size of s x s window of pixels centered around this pixel

  Code example:

  The following example binarizes a DJVU image with Bradley's adaptive thresholding algorithm with the specified window size. Binarized images contain only 2 colors - black and white.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Binarize the image with a brightness difference of 5. The brightness is a difference between a pixel and the average of an 10 x 10 window of pixels centered around this pixel.
      djvuImage.binarizeBradley(5, 10);
      djvuImage.save(dir + "sample.BinarizeBradley5_10x10.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• grayscale

  public void grayscale()

  Transformation of an image to its grayscale representation

  Overrides:

  grayscale in class RasterCachedMultipageImage

  Code example:

  The following example transforms a colored DJVU image to its grayscale representation. Grayscale images are composed exclusively of shades of gray and carry only intensity information.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      djvuImage.grayscale();
      djvuImage.save(dir + "sample.Grayscale.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• adjustGamma

  public void adjustGamma(float gamma)

  Gamma-correction of an image.

  Overrides:

  adjustGamma in class RasterCachedMultipageImage

  Parameters:

  gamma - Gamma for red, green and blue channels coefficient

  Code example:

  The following example performs gamma-correction of a DJVU image.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Set gamma coefficient for red, green and blue channels.
      djvuImage.adjustGamma(2.5f);
      djvuImage.save(dir + "sample.AdjustGamma.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• adjustGamma

  public void adjustGamma(float gammaRed,
                          float gammaGreen,
                          float gammaBlue)

  Gamma-correction of an image.

  Overrides:

  adjustGamma in class RasterCachedMultipageImage

  Parameters:

  gammaRed - Gamma for red channel coefficient

  gammaGreen - Gamma for green channel coefficient

  gammaBlue - Gamma for blue channel coefficient

  Code example:

  The following example performs gamma-correction of a DJVU image applying different coefficients for color components.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Set individual gamma coefficients for red, green and blue channels.
      djvuImage.adjustGamma(1.5f, 2.5f, 3.5f);
      djvuImage.save(dir + "sample.AdjustGamma.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• adjustBrightness

  public void adjustBrightness(int brightness)

  Adjust of a brightness for image.

  Overrides:

  adjustBrightness in class RasterCachedMultipageImage

  Parameters:

  brightness - Brightness value.

  Code example:

  The following example performs brightness correction of a DJVU image.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Set the brightness value. The accepted values of brightness are in the range [-255, 255].
      djvuImage.adjustBrightness(50);
      djvuImage.save(dir + "sample.AdjustBrightness.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• adjustContrast

  public void adjustContrast(float contrast)

  Image contrasting

  Overrides:

  adjustContrast in class RasterCachedMultipageImage

  Parameters:

  contrast - Contrast value (in range [-100; 100])

  Code example:

  The following example performs contrast correction of a DJVU image.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Set the contrast value. The accepted values of contrast are in the range [-100f, 100f].
      djvuImage.adjustContrast(50f);
      djvuImage.save(dir + "sample.AdjustContrast.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• filter

  public void filter(Rectangle rectangle,
                     FilterOptionsBase options)

  Filters the specified rectangle.

  Overrides:

  filter in class RasterCachedMultipageImage

  Parameters:

  rectangle - The rectangle.

  options - The options.

  Code example:

  The following example applies various types of filters to a DJVU image.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Apply a median filter with a rectangle size of 5 to the entire image.
      djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.MedianFilterOptions(5));
      djvuImage.save(dir + "sample.MedianFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Apply a bilateral smoothing filter with a kernel size of 5 to the entire image.
      djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.BilateralSmoothingFilterOptions(5));
      djvuImage.save(dir + "sample.BilateralSmoothingFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Apply a Gaussian blur filter with a radius of 5 and a sigma value of 4.0 to the entire image.
      djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.GaussianBlurFilterOptions(5, 4.0));
      djvuImage.save(dir + "sample.GaussianBlurFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Apply a Gauss-Wiener filter with a radius of 5 and a smooth value of 4.0 to the entire image.
      djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.GaussWienerFilterOptions(5, 4.0));
      djvuImage.save(dir + "sample.GaussWienerFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Apply a motion wiener filter with a length of 5, a smooth value of 4.0 and an angle of 90.0 degrees to the entire image.
      djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.MotionWienerFilterOptions(10, 1.0, 90.0));
      djvuImage.save(dir + "sample.MotionWienerFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  
  image = com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Apply a sharpen filter with a kernel size of 5 and a sigma value of 4.0 to the entire image.
      djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.SharpenFilterOptions(5, 4.0));
      djvuImage.save(dir + "sample.SharpenFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• resize

  public void resize(int newWidth,
                     int newHeight,
                     ImageResizeSettings settings)

  Resizes the image.

  Overrides:

  resize in class RasterCachedMultipageImage

  Parameters:

  newWidth - The new width.

  newHeight - The new height.

  settings - The resize settings.

  Code example:

  This example loads a DJVU image and resizes it using various resizing settings.

  ---

  String dir = "c:\\temp\\";
  
  com.aspose.imaging.ImageResizeSettings resizeSettings = new com.aspose.imaging.ImageResizeSettings();
  
  // The adaptive algorithm based on weighted and blended rational function and lanczos3 interpolation.
  resizeSettings.setMode(com.aspose.imaging.ResizeType.AdaptiveResample);
  
  // The small rectangular filter
  resizeSettings.setFilterType(com.aspose.imaging.ImageFilterType.SmallRectangular);
  
  // The number of colors in the palette.
  resizeSettings.setEntriesCount(256);
  
  // The color quantization is not used
  resizeSettings.setColorQuantizationMethod(com.aspose.imaging.ColorQuantizationMethod.None);
  
  // The euclidian method
  resizeSettings.setColorCompareMethod(com.aspose.imaging.ColorCompareMethod.Euclidian);
  
  com.aspose.imaging.Image image = (com.aspose.imaging.Image) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;
  
      // Scale down by 2 times using adaptive resampling.
      djvuImage.resize(image.getWidth() / 2, image.getHeight() / 2, resizeSettings);
  
      // Save to PNG
      djvuImage.save(dir + "downsample.adaptive.png", new com.aspose.imaging.imageoptions.PngOptions());
  } finally {
      image.dispose();
  }
  

  ---

• cacheData

  public void cacheData()

  Caches the data private.

  Overrides:

  cacheData in class RasterCachedMultipageImage

  Code example:

  The following example shows how to cache all pages of a DJVU image.

  ---

  String dir = "c:\\temp\\";
  
  // Load an image from a DJVU file.
  com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
  try {
      // This call caches all the pages so that no additional data loading will be performed from the underlying data stream.
      image.cacheData();
  
      // Or you can cache the pages individually.
      for (com.aspose.imaging.fileformats.djvu.DjvuPage page : image.getPages()) {
          page.cacheData();
      }
  } finally {
      image.dispose();
  }
  

  ---